u/muttstang77

There are 2 steel inserts that guide the bolt inside of the receiver. I'm using a scorpion evo mag. The upper is a 1.5" OD with 1/8" wall aluminum square tube. Trunion is machined from aluminum. I'm making it with the 5.5" chaszel liner. It has last round hold open, an extra trip linkage for the non buffer tube design.

I do have an MnP22 built up but I cut the feed ramp too deep into the chamber so I'm getting case ruptures, fortunately with the current design it doesn't damage anything other then the magazine.

handguard has a nice loft to allow for the whisper pickle..

Section view shows provisions for fun parts

bolt back

In battery so you can see the rollers pushed into the recesses

Non reciprocating charging handle with provisions to slap it

Here you can see the trip linkage installed. the upper pins in front and is held down in back with a spring loaded catch